[argyllcms] AW: Matrox P650 doesn't seem to want to play...

  • From: Thomas Kumlehn <thomaskumlehn@xxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Wed, 13 Dec 2006 12:11:07 +0000 (GMT)

I'm not sure if this is related to the P650, but some graphics cards have great 
10bit LUTs but bypass them when outputting digitally over DVI, just because 
they are placed by design between Memory path and DAC and not also between 
Memory path and DVI chip. Currently no off-the-shelf LCD known to me, takes 
10bit per colour channel. All need 8x3bits.
Thomas Kumlehn 

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----- Ursprüngliche Mail ----
Von: Neil Woolford <neil@xxxxxxxxxxxxxxxxxx>
An: argyllcms@xxxxxxxxxxxxx
Gesendet: Mittwoch, den 13. Dezember 2006, 12:02:06 Uhr
Betreff: [argyllcms] Matrox P650 doesn't seem to want to play...

Just about to calibrate my new twin head X11 Ubuntu Linux 64 bit AMD
system, running two DVI interfaced flat screens with the Xinerama

Runnning dispwin shows the colour squares on both displays (choose with
-d option), but the screen doesn't darken or lighten at the end of the
sequence.  I take this to mean that the LUT isn't being updated by the

Before I look into this further, are there any known issues with the
Matrox P650 card and Argyll?  As far as I know, the card is supposed to
have two LUTs, one for each output channel.  One of several reasons that
I selected it...


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